Am 31.01.2017 um 22:51 schrieb Gianluca Cecchi:
Hello,
suppose I want to use a special configuration for my IBM/1814 storage array
luns, then I put something like this in multipath.conf
devices {
device {
vendor "IBM"
product "^1814"
product_blacklist "Universal Xport"
path_grouping_policy "group_by_prio"
path_checker "rdac"
features "0"
hardware_handler "1 rdac"
prio "rdac"
failback immediate
rr_weight "uniform"
no_path_retry "12"
}
}
In CentOS 6.x when you restart multipathd or restart server, using
multipathd -k
multipathd> show config
multipathd> exit
That prints out the build-in defaults. See
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/pdf/DM_Multipath/Red_Hat_Enterprise_Linux-7-DM_Multipath-en-US.pdf
chapter 4.
in output you see your particular configuration instead than the default
one for this particular device.
In CentOS 7.3 instead I see it two times, the first one with the default
built-in values (eg "no_path_retry fail") and at the end the customized
one.
So it is not clear what is the actual configuration that device mapper
multipath is using...
The last wins?
Is this expected behaviour? In that case what command can I use to
crosscheck it (apart from real testing that is anyway necessary to verify
too)?
Eg in CentOS 7.3 I'm using device-mapper-multipath-0.4.9-99.el7_3.1.x86_64
while on CentOS 6.8 I'm using device-mapper-multipath-0.4.9-93.el6.x86_64
Thanks in advance,
Gianluca
To configure a custom setup and enable it please see chapter 3 of the
RHEL documentation about device-mapper multipath.
Regards
Alexander
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